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Fixes to afl-cc and documentation (#1974)

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* Always compile with -ldl when building for CODE_COVERAGE

When building with CODE_COVERAGE, the afl runtime contains code that
calls `dladdr` which requires -ldl. Under most circumstances, clang
already adds this (e.g. when building with pc-table), but there are some
circumstances where it isn't added automatically.

* Add visibility declaration to __afl_connected

When building with hidden visibility, the use of __AFL_LOOP inside such
code can cause linker errors due to __afl_connected being declared
"hidden".

* Update docs to clarify that CODE_COVERAGE=1 is required for dynamic_covfilter
This commit is contained in:
Christian Holler (:decoder)
2024-01-30 15:30:18 +01:00
committed by GitHub
parent 75af391408
commit 644e069450
3 changed files with 16 additions and 2 deletions
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7
src/afl-cc.c
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@ -1521,7 +1521,7 @@ void add_defs_persistent_mode(aflcc_state_t *aflcc) {
"({ static volatile const char *_B __attribute__((used,unused)); "
" _B = (const char*)\"" PERSIST_SIG
"\"; "
"extern int __afl_connected;"
"extern __attribute__((visibility(\"default\"))) int __afl_connected;"
#ifdef __APPLE__
"__attribute__((visibility(\"default\"))) "
"int _L(unsigned int) __asm__(\"___afl_persistent_loop\"); "
@ -2311,6 +2311,11 @@ void add_runtime(aflcc_state_t *aflcc) {
}
#if __AFL_CODE_COVERAGE
// Required for dladdr used in afl-compiler-rt.o
insert_param(aflcc, "-ldl");
#endif
#if !defined(__APPLE__) && !defined(__sun)
if (!aflcc->shared_linking && !aflcc->partial_linking)
insert_object(aflcc, "dynamic_list.txt", "-Wl,--dynamic-list=%s", 0);